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PD CEN/TR 16797-1:2015

Current
Current

The latest, up-to-date edition.

Construction products: Assessment of release of dangerous substances. Guidance on the statistical assessment of declared values Principles and rules of application
Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

30-09-2015

European foreword
Introduction
1 Scope
2 Declared values
3 Other principles
4 Uncertainty
5 Rules of application
Bibliography

Gives guidance on the statistical assessment of declared values with respect to the release, emission and/or content of dangerous substances.

This Technical Report provides guidance on the statistical assessment of declared values with respect to the release, emission and/or content of dangerous substances. This Technical Report provides statistically-based criteria for type-testing (TT), further-testing (FT) and where a product has been shown to be consistent with measured values for the release, emission or content that are significantly below the declared values, the point where no-further-testing (NFT) is permitted. A series of fundamental principles are defined in the present document and two statistical approaches are defined. The first approach is to use assessment by variables and this approach requires the data to be normally or log-normally distributed. This approach is recommended as the default option. The alternative approach based on assessment by attributes is appropriate for data sets that are not normally or log-normally distributed. The downside to this form of assessment is that more test data are needed for the same level of reliability. The present document introduces these assessment procedures and CEN/TR16797‑2 provides more detail and the statistical proof that they satisfy the principles defined in this document. With both of these approaches the minimum frequency of testing is a function of the distance between the mean value and declared value and the variability of the data set, i.e. the sample standard deviation. To reduce the costs of testing, production plants producing a similar product may share data, e.g. be grouping the product into clusters for statistical assessment of declared values. Rules for the use of clusters are given in CEN/TR16797‑2 . CEN/TR16797‑2 also contains rules for identifying outliers within a data set and guidance on using tests other than the reference method for FT. A list of tasks for product technical committees is given in CEN/TR16797‑2 as is a model clause for including in product standards and rules of applications that may be cited in the product standard or copied into product standards.

Committee
B/557
DocumentType
Standard
Pages
28
PublisherName
British Standards Institution
Status
Current

Standards Relationship
CEN/TR 16797-1:2015 Identical

305/2011 : 2011 AMD 2 2014 REGULATION (EU) NO 305/2011 OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL OF 9 MARCH 2011 LAYING DOWN HARMONISED CONDITIONS FOR THE MARKETING OF CONSTRUCTION PRODUCTS AND REPEALING COUNCIL DIRECTIVE 89/106/EEC (TEXT WITH EEA RELEVANCE)
89/106/EEC : 1988 COUNCIL DIRECTIVE OF 21 DECEMBER 1988 ON THE APPROXIMATION OF LAWS, REGULATIONS AND ADMINISTRATIVE PROVISIONS OF THE MEMBER STATES RELATING TO CONSTRUCTION PRODUCTS
CEN/TR 16797-2:2015 Construction products: Assessment of release of dangerous substances - Guidance on the statistical assessment of declared values - Part 2: Technical and statistical background

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